Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable, Number of Shares Issuable	3,438,128
Not vested, Number of Shares Issuable	690,000
Balance, Number of Shares Issuable	4,128,128	7,502,421	5,710,125
Exercisable, Weighted-Average Exercise Price	$ 1.03
Not vested, Weighted-Average Exercise Price	$ 1.06
Balance, Weighted-Average Exercise Price	$ 1.04	$ 1.00	$ 1.10
Exercisable, Weighted-Average Remaining Term (Years)	2 years 6 months
Not vested, Weighted-Average Remaining Term (Years)	3 years 4 months 24 days
Balance, Weighted-Average Remaining Term (Years)	2 years 8 months 12 days
Exercisable, Aggregate Intrinsic Value	$ 3,000
Not vested, Aggregate Intrinsic Value	0
Balance, Aggregate Intrinsic Value	$ 3,000